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  • 1
    Electronic Resource
    Electronic Resource
    Speciation of sulphur in soils and soil particles by X-ray spectromicroscopy (2003)
    Oxford, UK : Blackwell Science Ltd
    European journal of soil science 54 (2003), S. 0 
    Details
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Current wet chemical methods for the speciation of sulphur (S) in soils are inaccurate and do not allow one to assess the S speciation of individual soil particles and colloids. X-ray microscopy and Near Edge X-ray Absorption Fine structure Spectroscopy (NEXAFS) can be used to study individual species of S at the K-adsorption edge. We have used these techniques to identify and quantify S species in bulk soil, soil particles and colloids from Oh and Bh horizons of two forested Podzols. The partitioning of soil sulphur as determined on bulk samples of the Oh horizons by X-ray spectromicroscopy agreed fairly well with the results of a conventional S speciation for the soil at Schluchsee, and reasonably well for that at Rotherdbach. The NEXAFS analyses on individual soil particles revealed that they are richer in reduced organic sulphur than the bulk soil for the Schluchsee Oh and richer in sulphate for Rotherdbach Oh. The techniques can be used reliably to separate and quantify sulphur species with different oxidation states in the soil. The combination of X-ray transmission and sulphur fluorescence images with unfocused and focused NEXAFS spectra at the K-adsorption edge of sulphur at specific microsites allowed us to compare the distribution of S species in bulk soil with that of distinct soil particles and soil colloids. Moreover, we can use it to assess the spatial distribution of different S species on soil particles on a scale of a few hundred nanometres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2389.2003.00543.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    X Ray Microscopy-State of the Art and Expected Developments (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 483 (1986), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1986.tb34557.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Aggregation in Pickering emulsions (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 257-260 
    Details
    ISSN: 1435-1536
    Keywords: Key words Bentonite ; Hydrotalcites ; Layered double hydroxides ; Pickering emulsions ; X-ray microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract For the first time, the particle distribution and aggregation in Pickering emulsions were made visible by transmission X-ray microscopy. Oil/water emulsions were stabilized by heterocoagulates of a clay mineral and magnesium aluminum hydroxide. Stability is optimum when the particles surround the oil droplets and also assemble to form a network extending through the coherent phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00013752
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Fractal characterization of hematite aggregates by X-ray microscopy (1996)
    Springer
    International journal of earth sciences 85 (1996), S. 852-856 
    Details
    ISSN: 1437-3262
    Keywords: Hematite ; Aggregates ; X-ray microscopy ; Fractal geometry ; Colloids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract X-ray microscopy supplies the actual morphology of hematite aggregates in an aqueous dispersion medium. The fractal dimension of hematite aggregates has been determined below and above the critical coagulation concentration. The box-counting method has been used as a morphometric tool. The values obtained are not in accordance with the values produced by numerical approaches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02440115
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Towards a synthesis method for distributed safety controllers based on net condition/event systems (1997)
    Springer
    Journal of intelligent manufacturing 8 (1997), S. 357-368 
    Details
    ISSN: 1572-8145
    Keywords: Forbidden states ; modular logic controllers ; synthesis ; condition/event systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An idea is presented for the synthesis of modular distributed controllers for forbidden state problems. The model of the uncontrolled plant behaviour is designed in a modular way by net condition/event systems. This modularity is the precondition for classification of forbidden markings with respect to design of local controllers. A modified backward search method is proposed for synthesis of the function of local controllers as well as for their communication. The method is illustrated using a manufacturing system example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018502131099
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Fractal characterization of hematite aggregates by X-ray microscopy (1996)
    Springer
    Geologische Rundschau 85 (1996), S. 852-856 
    Details
    ISSN: 0016-7835
    Keywords: Key words Hematite ; Aggregates ; X-ray microscopy ; Fractal geometry ; Colloids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  X-ray microscopy supplies the actual morphology of hematite aggregates in an aqueous dispersion medium. The fractal dimension of hematite aggregates has been determined below and above the critical coagulation concentration. The box-counting method has been used as a morphometric tool. The values obtained are not in accordance with the values produced by numerical approaches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050116
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    Paper (German National Licenses)
    Fulltext
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